/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dbw.test;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;

/**
 * This is an example on how to get some x/y coordinates of text.
 *
 * @author Ben Litchfield
 */
public class PrintTextLocations extends PDFTextStripper {

    private TextPosition lineHeadTextPosition = null;

    private StringBuffer lineBuffer = new StringBuffer();

    /**
     * Instantiate a new PDFTextStripper object.
     *
     * @throws IOException
     *             If there is an error loading the properties.
     */
    public PrintTextLocations() throws IOException {
    }

    /**
     * This will print the documents data.
     *
     * @param args
     *            The command line arguments.
     *
     * @throws IOException
     *             If there is an error parsing the document.
     */
    public static void main(String[] args) throws IOException {
        if (args.length != 1) {
            usage();
        } else {
            PDDocument document = null;
            try {
                document = PDDocument.load(new File(args[0]));

                PDFTextStripper stripper = new PrintTextLocations();
                stripper.setSortByPosition(true);
                stripper.setStartPage(0);
                stripper.setEndPage(document.getNumberOfPages());

                Writer dummy = new OutputStreamWriter(new ByteArrayOutputStream());
                stripper.writeText(document, dummy);

            } finally {
                if (document != null) {
                    document.close();
                }
            }
        }
    }

    /**
     * Override the default functionality of PDFTextStripper.
     */
    @Override
    protected void writeString(String string, List<TextPosition> textPositions) throws IOException {
        // for (TextPosition text : textPositions)
        // {
        // System.out.println( "String[" + text.getXDirAdj() + "," +
        // text.getYDirAdj() + " fs=" + text.getFontSize() + " xscale=" +
        // text.getXScale() + " height=" + text.getHeightDir() + " space=" +
        // text.getWidthOfSpace() + " width=" +
        // text.getWidthDirAdj() + "]" + text.getUnicode() );
        // }

        TextPosition textPosition = textPositions.get(0);
        // System.out.printf("[%f, %f] (%f) %s\n",
        // textPosition.getXDirAdj(), textPosition.getYDirAdj(),
        // /*textPosition.getFont().getAverageFontWidth(),*/
        // textPosition.getHeightDir(),
        // string);

        if (lineHeadTextPosition == null) {
            lineHeadTextPosition = textPosition;
            lineBuffer.append(string);
            lineBuffer.append(" ");
            return;
        }

        if (textPosition.getYDirAdj() != lineHeadTextPosition.getYDirAdj()) {
            if (textPosition.getHeightDir() != lineHeadTextPosition.getHeightDir()) {
                printLine();
                lineHeadTextPosition = textPosition;
                lineBuffer = new StringBuffer();
                lineBuffer.append(string);
                lineBuffer.append(" ");
                return;
            }
        }

        lineBuffer.append(string);
        lineBuffer.append(" ");
    }

    private void printLine() {
        String line = lineBuffer.toString();
        if (line.length() > 100) {
            return;
        }

        // if(Math.abs(lineHeadTextPosition.getHeightDir() - 8.04) > 0.01
        // && Math.abs(lineHeadTextPosition.getHeightDir() - 7.8) > 0.01) {
        // return;
        // }
        // System.out.println(line);
        System.out.printf("[P%03d] (%f) %s\n", getCurrentPageNo(), lineHeadTextPosition.getHeightDir(), line);
    }

    /**
     * This will print the usage for this document.
     */
    private static void usage() {
        System.err.println("Usage: java " + PrintTextLocations.class.getName() + " <input-pdf>");
    }
}
